Relative humidity changes by evaporation of soil moisture at ground surface in which high soil suction into soil structure of unsaturated soils has induced. Geotechnical engineers requires to evaluate internal friction angle,
Φ, and cohesion,
c, as strength parameter for unsaturated soil with high soil suction. This study focuses on
Φ and
c of unsaturated soil with various soil suction. In the test programs, statically compacted soil specimens were prepared, and three different triaxial tests were performed to examine shear properties. High soil suction triaxial test and constant water content test were conducted to estimate the strength parameters of unsaturated soil specimen. In addition, effective internal friction angle was measured by consolidated drained triaxial tests using saturated soil specimens. As results obtained from three different triaxial tests, it was evident that the internal friction angle of compacted unsaturated soil is obviously similar to that of saturated soil.
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